Raiders camp: Day 2

Raiders coach Lane Kiffin declared the defense a winner in the first of two practices Friday. One telltale sign was all those loose balls bouncing on the ground.

The Raiders’ offense fumbled six balls during the morning workout at the Napa Valley Marriott. Three were botched center exchanges, three were forced by aggressive swipes.

One of those came from new strong safety Gibril Wilson, the former City College of San Francisco star who was brought in to add muscle to the run defense and secondary. Javon Walker came down with a jumping catch downfield, only for Wilson to sock the ball free from behind. Cornerback DeAngelo Hall recovered the fumble.

Safeties haven’t created many fumbles in years for Oakland. So far, Wilson is earning his $39 million keep.

“Gibril really is bringing a good mentality to our defense,” Kiffin said. “He’s extremely physical, which is good to see. Our defense needs to see that.”

Quarterback Marques Tuiasosopo fumbled two snaps from fourth-string center Jesse Boone. Andrew Walter lost the third snap, while receiver Jonathan Holland lost one catch and running back Adimchinobe Echemandu lost another ball.

The penalty for all involved: one lap around the field, on the spot. Same goes for offside-movers Kwame Harris and Kalimba Edwards.

New injuries: Safety Greg Wesley, a 10th-year veteran signed Tuesday, missed practice with back smasms. Such a quick injury brings back memories of Donovin Darius, a veteran pickup last year who limped his way to a cut-day exit.

Converted defensive lineman Fred Wakefield left practice with an undisclosed injury and defensive end Greg Spires missed a second straight practice with a hamstring injury. Undrafted rookie receiver Marcel Reece and outside linebacker Grant Irons also sat out with a hamstring injuries.

Jordan update: Kiffin said the LaMont Jordan will come to a close at some point today. The options are trade him (unlikely), let him practice (very unlikely) or release him (most likely).

Practice highlights: Second-year defensive end Jay Richardson caught Darren McFadden from behind in the backfield on a play running to the opposite side. He also helped force Echemandu’s fumble despite double-team blocking. The right end job is his to lose. … Nose tackle Gerard Warren forced a fumbled snap with a perfectly timed swim move. He also had what would have been a sack if hitting quarterbacks was permissable. … During blocking drills, McFadden held his own against hard-charging middle linebacker Edgerton Hartwell. No easy task … The offense keeps going to safety-valve dumpoff passes to a running back underneath when nothing else opens up. Even the fullbacks are getting some action. … Middle linebacker Kirk Morrison stuffed Justin Fargas with a burst up the middle. That’s the sort of improvement this run defense needs. … Center Jake Grove took the majority of first-team snaps, which is more about him catching up from a missed offseason than a depth-chart statement. The Raiders go again tonight from 7-9 p.m.